[Pacemaker] auto_tie_breaker in two node cluster

Kostiantyn Ponomarenko konstantin.ponomarenko at gmail.com
Tue May 20 04:14:55 EDT 2014

I am not quite understand how auto_tie_breaker works.
Say we have a cluster with 2 nodes and enabled auto_tie_breaker feature.
Each node has 2 NICs. One NIC is used for cluster communication and another
one is used for providing some services from the cluster.
So the question is how the nodes will distinguish between two possible
1) connection between the nodes are lost, but the both nodes remain working;
2) power supply on the node 1 (has the lowest node-id) broke down and node
2 remain working;

In 1st case, according to the description of the auto_tie_breaker, the node
with the lowest node-id in the cluster will remain working.
And in that particular situation it is good result because the both nodes
are in good state (the both can remain working).
In 2nd case the only working node is #2 and the node-id of that node is not
the lowest one. So what will be in this case? What logic will work, because
we have lost the node with the lowest node id in 2-node cluster?

> there is no qdiskd for votequorum yet
Is there plans to implement it?

Many thanks,
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